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​A certain type of electronic component has a lifetime Y (in hours) with probability density function given by


A certain type of electronic component has a lifetime Y (in hours) with probability density function given by 

image.png

That is, Y has a gamma distribution with parameters α = 2 and θ. Let image.png denote the MLE of θ. Suppose that three such components, tested independently, had lifetimes of 120, 130, and 128 hours. 

a Find the MLE of θ. 

b Find E(image.png) and V(image.png). 

c Suppose that actually equals 130. Give an approximate bound that you might expect for the error of estimation. 

d What is the MLE for the variance of Y?

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